1. 1/3 cup cornstarch
2. 1/4 cup cocoa powder
3. 1/2 tsp salt
4. 12 oz semi-sweet chocolate chips
5. 6 Tbsp unsalted butter, diced into 1 Tbsp pieces, plus more for baking dish
6. 3/4 cup granulated sugar
7. 3 large eggs
8. 1 tsp vanilla
9. 1 cup chopped pecans
Directions
Preheat oven to 350 degrees. In a mixing bowl whisk together cornstarch, cocoa powder and salt, set aside. Add chocolate chips to a microwave safe bowl, top with butter and heat mixture in microwave on HIGH power in 20 second intervals, stirring after each interval until melted and smooth. Stir in sugar, then mix vanilla and eggs one at a time, mixing until combined after each addition. Add dry mixture and stir until well blended and smooth, then mix in pecans. Pour batter into a well buttered 8 by 8-inch baking dish (you can also line the baking dish with parchment if desired, then pour batter over parchment) and spread into an even layer. Bake in preheated oven until toothpick inserted into center comes out with a few moist crumbs attached, about 35 - 38 minutes. Allow to cool completely then cut into squares (I found mine cut cleaner after freezing for about 45 minutes - after cooling, if you can waiting any longer).
Recipe Source: adapted from Martha Stewart